Squaring and Cubing

/by

Find numbers that are either squares or cubes.

Read more

Forgetful Fran

/by

Help Fran remember how much money she loaned each friend.

Read more

Measuring Exact Amounts

/by

Can you produce exactly 3 gallons of water? 

Read more

The Horse Problem

/by

How much does a man make or lose in the horse-trading business?

Read more

Paying for Lunch

/by

What happened to the other dollar?

Read more

Magic Circle

/by

Make the sum of all rows equal the same number.

Read more

Magic Hexagon

/by

Make the sum of each of the rows equal certain numbers.  In the hexagons below, place the numbers 1-19 so that rows, columns and diagonals all add up to 38. (Source: Eric W. Weisstein) Extension: Place the numbers 1-19 in the circles so the sum of each of the rows with three circles around the […]

Read more

Magic Square

/by

Make the sum of the numbers in the rows, columns, and diagonals of a grid all equal the same integer. 

Read more

Calendar Math

/by

Will the sum of four numbers always be the same?

Read more

Those Numbers Below

/by

Consider the use of the word “below” for negative numbers.

Read more